/**
 * @author alteredq / http://alteredqualia.com/
 * @author mr.doob / http://mrdoob.com/
 */

export default  {
    
        canvas: !! window.CanvasRenderingContext2D,
        webgl: ( function () {
    
            try {
    
                var canvas = document.createElement( 'canvas' ); return !! ( window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ) );
    
            } catch ( e ) {
    
                return false;
    
            }
    
        } )(),
        workers: !! window.Worker,
        fileapi: window.File && window.FileReader && window.FileList && window.Blob,
    
        getWebGLErrorMessage: function () {
    
            var element = document.createElement( 'div' );
            element.id = 'webgl-error-message';
            element.style.fontFamily = 'monospace';
            element.style.fontSize = '13px';
            element.style.fontWeight = 'normal';
            element.style.textAlign = 'center';
            element.style.background = '#fff';
            element.style.color = '#000';
            element.style.padding = '1.5em';
            element.style.width = '400px';
            element.style.margin = '5em auto 0';
    
            if ( ! this.webgl ) {
    
                element.innerHTML = window.WebGLRenderingContext ? [
                    'Your graphics card does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br />',
                    'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
                ].join( '\n' ) : [
                    'Your browser does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br/>',
                    'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
                ].join( '\n' );
    
            }
    
            return element;
    
        },
    
        addGetWebGLMessage: function ( parameters ) {
    
            var parent, id, element;
    
            parameters = parameters || {};
    
            parent = parameters.parent !== undefined ? parameters.parent : document.body;
            id = parameters.id !== undefined ? parameters.id : 'oldie';
    
            element = Detector.getWebGLErrorMessage();
            element.id = id;
    
            parent.appendChild( element );
    
        }
    
    };
